1 3

About WACKER Silicone Encapsulants and Potting Compounds

Silicone encapsulants from WACKER are effective for the potting and encapsulation of electronic control units, sensors, printed circuit boards, semiconductor devices or microchips. Potting or encapsulation provides efficient protection from the environment, assisting in reliable operation and the lifetime of electronic devices.

We offer one and two component WACKER products for potting and encapsulation applications. Silicone gels offer minimal thermal stress on sensitive parts and ensure that the device will work properly even when exposed to extreme temperature fluctuations or strong vibrations. For sensor applications, gels characterised by particularly low volatility and low bleed are becoming increasingly important.

Features & Benefits

  • High thermal shock resistance
  • Low shrinkage
  • Good adhesion including to polymer housings
  • Low outgassing
  • Low uncured-silicone bleed
  • Formulations from Shore 00-55 to A80
  • Transparent versions available

Applications

Product Cure Mechanism Curing Time Colour Characteristics
Elastosil E10 Acetoxy 12 h at 23°C Red Flowable sealant. Excellent heat stability. Good mechanical properties. Low hardness.
Elastosil E50N Acetoxy 12 h at 23°C Translucent Translucent. Food compliant. Medium hardness.
Elastosil N2034 Alkoxy Black Flow-able and spray-able. Self-levelling. Low hardness.
Elastosil RT 428 Addition 8 – 15 h at 23°C Reddish Brown Flow-able, high hardness and excellent heat resistance.
Elastosil RT 601 Addition 24 h at 23°C Transparent General-purpose potting compound. Manufacture of solar panels. RI=1.409. Food compliant.
Elastosil RT 602 Addition 24 h at 23°C Light grey Low viscosity. Rapid heat curing. Medium hardness. Excellent heat stability.
Elastosil RT 604 Addition 24 h at 23°C
30 min at 70°C
8 min at 100°C
5 min at 150°C
Transparent Highly transparent. Food-compliant. Softer lower viscosity than RT 601.
Elastosil RT 607 Addition 24 h at 23°C Reddish Brown Flame-retardant. Good heat resistance. Food-compliant.
Elastosil RT 745 Addition 60 mins at 80°C
10 min at 120°C
5 min at 150°C
Transparent-brownish Tough gel with primerless adhesion and rapid heat cure.
Elastosil RT 745 S Addition 60 mins at 80°C
10 min at 120°C
5 min at 150°C
Transparent-brownish Crystal clear silicone gel. Very low bleed. Flame retardant. Rapid heat cure.
SilGel 612 Addition 8 h at 23°C
15 min at 100°C
5 min at 150°C
Transparent General-purpose potting compound. Manufacture of solar panels. RI=1.404. Pronounced inherent tack. Low bleed. Good damping properties.
SilGel 613 Addition 4 h at 23°C
10 min at 100°C
5 min at 150°C
Transparent Similar to SilGel 612, but works with catalysts to speed up curing, including a UV-curing catalyst.
Silpuran 4200 Condensation 12 h at 23°C Translucent Biocompatible. ISO 10993 and USP Class VI compliant. Fast skin time. Medium hardness.
Elastosil RT K Condensation 7 h at 23°C Grey General purpose potting compound. Excellent flowability.
Elastosil RT 426 Condensation 24 h at 23°C Reddish Brown Excellent heat resistance. High hardness.
Semicosil 961 TC Addition 5 h at 23°C
5 min at 100°C
Yellow Thermally conductive gap filler. Shear-thinning. Easy-dispensing. Non-slump. Soft and tacky rubber.

Specifications

Product Mix ratio Viscosity mPas Hardness Tensile Strength N/mm2 Elongation % Temp Range Pot Life Volume Resistivity Ohm.cm Dielectric Strength kV/mm Thermal Conductivity W/m k
Elastosil E10 Single part 8,000 Shore A 25 2.5 300 250°C 10^15 21 0.2
Elastosil E50N Single part 50,000 Shore A 35 1.5 150 180°C 0.2
Elastosil N2034 Single part 15,000 Shore A 35 2.0 200 -50° to 180°C 0.2
Elastosil RT 428 100:3 12,000 Shore A 65 6.0 90 50 – 100 mins 0.3
Elastosil RT 601 9:1 3,500 Shore A 45 6.0 100 150°C 90 mins 10^15 23 0.2
Elastosil RT 602 9:1 3,500 Shore A 30 1.5 130 200°C 80 mins 10^15 0.2
Elastosil RT 604 9:1 800 Shore A 25 1.0 100 150°C 90 mins 10^15 23 0.2
Elastosil RT 607 9:1 10,000 Shore A 55 3.5 100 210°C 80 mins 10^15 23 0.4
Elastosil RT 745 1:1 1,000 Shore A 15 160°C 240 mins 10^16 0.2
Elastosil RT 745 S 1:1 1,000 Shore A 37 160°C 240 mins 10^15 0.2
SilGel 612 1:1 1,000 Very soft gel -50° to 180°C 150 mins 10^15 >23 0.2
SilGel 613 10:1 200 Very soft gel 160°C < 2 days 0.2
Silpuran 4200 1:1 300,000 Shore A 35 5.5 300 180°C
Elastosil RT K 100:4 7,000 Shore A 45 2.0 130 -50° to 180°C 150 mins 10^14 23 0.3
Elastosil RT 426 10,000 Shore A 60 4.5 120 -50° to 200°C 90 mins 0.4
Semicosil 961 TC 1:1 130,000 Shore A 25 -50° to 180°C 60 mins 10^13 8 2.3

Other Information

See how one customer got results from Wacker SilGel 612 for an LED encapsulation application in this Case Study:

Case Study: LED potting for signage with Wacker SilGel 612 Potting LED strips for outdoor signage made easy with silicone gel

A UK manufacturer of outdoor signage and lighting products was seeking to encapsulate their LED strips to protect them from environmental damage, whilst maintaining a desirable aesthetic in the finished product. Wacker SilGel 612 fit the bill.

All Downloads

Filename Size Download
Case Study: LED potting for signage with Wacker SilGel 612 0.24MB

Ordering Information

Our technical team are on hand to discuss your application requirements. Click here to get in touch.

Find out more information on how to purchase.

  • Last updated: July 2020
  • Version: 1.8

Semicosil®, Elastosil®, and SilGel® are registered trademarks of Wacker Chemie AG. Statements, technical information and recommendations contained herein are based on tests we believe to be reliable but they are not to be construed in any manner as warrantees expressed or implied. The user shall determine the suitability of the product for his intended use and the user assumes all risk and liability whatsoever in connection therewith.